merge with fil/waffle-stroke

Author: Fil

src/marks/waffle.js

@@ -141,7 +141,7 @@ function waffleRender(y) {
           .attr("transform", y === "y" ? template`translate(${x0},${y0})` : template`translate(${y0},${x0})`)
           .attr("d", (i) => `M${polygon[i].join("L")}Z`)
           .attr("fill", (i) => `url(#${patternId}-${i})`)
-          .attr("stroke", this.stroke == null ? null : (i) => `url(#${patternId}-${i})`)
+          .attr("stroke", this.stroke == null ? null : "none")
           .call(applyChannelStyles, this, {ariaLabel, href, title})
       )
       .node();